ICS9FG108 Datasheet, PDF (4/19 Pages) Integrated Circuit Systems – Programmable FTG for Differential P4 CPU, PCI-Express & SATA Clocks

ICS9FG108
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
Pin Description (continued)
PIN #
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
PIN NAME
DIF_STOP#
**SPREAD
*SEL14M_25M#
**OE_3
DIF_3#
DIF_3
VDD
DIF_2#
DIF_2
*OE_2
GND
VDD
*OE_1
DIF_1#
DIF_1
VDD
DIF_0#
DIF_0
**OE_0
**FS1
**FS0
IREF
GNDA
VDDA
PIN TYPE
IN
IN
IN
IN
OUT
OUT
PWR
OUT
OUT
IN
PWR
PWR
IN
OUT
OUT
PWR
OUT
OUT
IN
I/O
IN
OUT
PWR
PWR
DESCRIPTION
Active low input to stop differential output clocks.
Asynchronous, active high input to enable spread spectrum functionality.
Select 14.31818 MHz or 25 Mhz input frequency. 1 = 14.31818 MHz, 0 = 25 MHz
Active high input for enabling output 3.
0 = tri-state outputs, 1= enable outputs
0.7V differential complement clock output
0.7V differential true clock output
Power supply, nominal 3.3V
0.7V differential complement clock output
0.7V differential true clock output
Active high input for enabling output 2.
0 = tri-state outputs, 1= enable outputs
Ground pin.
Power supply, nominal 3.3V
Active high input for enabling output 1.
0 = tri-state outputs, 1= enable outputs
0.7V differential complement clock output
0.7V differential true clock output
Power supply, nominal 3.3V
0.7V differential complement clock output
0.7V differential true clock output
Active high input for enabling output 0.
0 = tri-state outputs, 1= enable outputs
Frequency select latch input pin / 3.3V 66.66MHz clock output.
3.3V Frequency select latched input pin.
This pin establishes the reference current for the differential current-mode output
pairs. This pin requires a fixed precision resistor tied to ground in order to establish
the appropriate current. 475 ohms is the standard value.
Ground pin for the PLL core.
3.3V power for the PLL core.
Note:
Pin names followed by '**' have 120 Kohm pull DOWN resistors
Pin names followed by '*' have 120 Kohm pull UP resistors
IDT^TM/ICS^TM Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
4
ICS9FG108 REV G 04/06/07